In Runescape how can I get red , green and blue d mask

你而家只可以向 player 買番來,
因為所有既 mask 係幾年前既 holiday item 物品,
而家係冇得去拎架喇,
想要的話去 market world 買啦,
大約 25-40mil 視付乜顏色 mask....

It should be "h'mask" (full name: Halloween mask). It's the 2002 Halloween Holiday Drop. There is no way to get them unless you buy from another player, which you proberly can't afford. They sell it for like 20M-40M, depends on the colour. Green mask cheapest, then blue, then red (Blue and green is somehow the same, +-5M).